Beyond PD-L1 tumour proportion score (TPS), other biomarkers such as tumour mutation burden (TMB), specific tumour mutations in TP53 and KRAS genes, inflammatory signatures including gamma interferon signalling and tumour-infiltrating lymphocytes (TIL) density have also been explored to predict benefit from anti-PD-1 agents [7,8]. The gene discussed is KRAS; the disease is neoplasm.